A safety arm assembly for a vehicle

By designing an adjustable cable channel and cable pull groove structure in the vehicle safety arm assembly, the problem of inconvenient cable threading in the prior art is solved, and convenient and protective cable guidance is achieved.

CN224413663UActive Publication Date: 2026-06-26NINGBO JINGTENG ZHICHENGLONG MASCH CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
NINGBO JINGTENG ZHICHENGLONG MASCH CO LTD
Filing Date
2025-07-16
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

The existing wiring channels for vehicle safety arm assemblies are fixed, making it inconvenient to thread cables for external electronic control components.

Method used

A vehicle safety arm assembly was designed, in which a square tube and a U-shaped block can slide relative to each other. The size of the cable passage can be adjusted by bolt assembly and fixing assembly, and cable pull grooves are provided on the four side walls of the square tube to facilitate the guidance and protection of the cable.

Benefits of technology

It achieves adjustable cable routing channels, improves the convenience and protection of cable routing, and avoids cable blockage and damage within the channels.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application relates to the technical field of engineering vehicle accessories, in particular to a vehicle safety arm assembly which comprises a square tube, a U-shaped block, a bow-shaped piece, a first bolt assembly, a fixing assembly and a mounting stopper, the square tube is provided with a wire passing cavity in the center; the U-shaped block is provided with a U-shaped groove, the side wall of the U-shaped groove is provided with a first bolt hole and a waist-shaped hole, the square tube extends into the U-shaped groove, one end of the bow-shaped piece is fixedly connected with the square tube, a sliding cavity is formed between the middle section of the bow-shaped piece and the top surface of the square tube; the first bolt assembly passes through the sliding cavity; the fixing assembly comprises an extended threaded column and a second nut, the extended threaded column is fixedly connected with one end of the square tube, the second nut is threadedly connected with the extended threaded column and abuts against or is separated from the U-shaped block; the mounting stopper is arranged in the U-shaped groove and connected with the U-shaped block, the mounting stopper is provided with a connecting hole, and the wire passing cavity is provided with a wire passing channel between the U-shaped block, and the wire passing channel can be adjusted through the fixing assembly.
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Description

Technical Field

[0001] This application relates to the field of engineering vehicle parts technology, and more specifically to a vehicle safety arm assembly. Background Technology

[0002] With the intelligent development of engineering equipment, multi-arm engineering vehicles are widely used. Patent document (CN220267732U) discloses a three-stage folding arm arch trolley, which includes a two-stage arm structure, namely the vehicle safety arm assembly referred to in this application.

[0003] There is a vehicle safety arm assembly, such as Figure 5 and Figure 6 As shown, the device includes a square tube 90, a U-shaped block 91, a stop block 92, and a transfer component 94. The square tube 90 has a cable passage cavity at its center. The U-shaped block 91 has a U-shaped groove 911. One end of the square tube 90 extends into the U-shaped groove 911 and abuts against the stop block 92. Both the square tube 90 and the stop block 92 are fixedly connected to the U-shaped block 91. The stop block 92 has a threaded hole. The transfer component 94 has an insertion end 941 and a hinged end 942 at both ends. The insertion end 941 extends into the U-shaped groove 911 and is bolted through the threaded hole. The hinged end 942 is rotatably connected to an external electrical control component. However, because the positions of the stop block and the square tube 90 are fixed, the cable passage between the square tube 90 and the stop block is small, making it inconvenient for the cable of the external electrical control component to pass through the cable passage.

[0004] Therefore, there is a need for a vehicle safety arm assembly with an adjustable wiring channel. Summary of the Invention

[0005] The main objective of this application is to provide a vehicle safety arm assembly, wherein the vehicle safety arm assembly includes a square tube, a U-shaped block, an arch-shaped component, a first bolt assembly, a fixing assembly, and a mounting block. The square tube has a cable-passing cavity at its center; the U-shaped block has a U-shaped groove, one end of the square tube extends into the U-shaped groove, and the side wall of the U-shaped groove has a first bolt hole and a slotted hole; the arch-shaped component is located at the top of one end of the square tube, and one end of the arch-shaped component is fixedly connected to the square tube, and the middle section of the arch-shaped component is spaced at a predetermined distance from the top surface of the square tube to form a sliding cavity; the first bolt assembly is threadedly connected to the first bolt hole and passes through the sliding cavity; the fixing assembly... The component includes an extended threaded post and a second nut. The extended threaded post is fixedly connected to one end of the square tube and extends a predetermined distance beyond the waist-shaped hole. The second nut is threadedly connected to the extended threaded post and abuts against or separates from the U-shaped block. The mounting block is disposed in the U-shaped groove and fixedly connected to the U-shaped block. The mounting block is spaced a predetermined distance from one end of the U-shaped groove. The mounting block has several connecting holes. A wire-passing channel is provided between the wire-passing cavity and the U-shaped block. The U-shaped block and the square tube can slide relative to each other. The size of the wire-passing channel can be adjusted to facilitate wire passing. The position between the U-shaped block and the square tube is fixed by the fixing component.

[0006] Another objective of this application is to provide a vehicle safety arm assembly, wherein each of the four side walls of the square tube has a cable pull groove, and the four cable pull grooves are arranged sequentially at intervals from one end to the other end of the square tube along its length direction, and the four cable pull grooves are arranged sequentially in a clockwise or counterclockwise direction on the four side walls of the square tube along its circumference, so that the cable pull grooves facilitate the assembly personnel to use external clamps to push the cable inside the cable cavity.

[0007] To achieve at least one of the above-mentioned objectives, this application provides a vehicle safety arm assembly, wherein the vehicle safety arm assembly includes:

[0008] A square tube, wherein the center of the square tube has a wire-passing cavity;

[0009] The U-shaped block has a U-shaped groove, one end of the square tube extends into the U-shaped groove, and the side wall of the U-shaped groove has a first bolt hole and a waist-shaped hole;

[0010] An arc-shaped component is located at the top of one end of the square tube, and one end of the arc-shaped component is fixedly connected to the square tube. The middle section of the arc-shaped component is spaced at a predetermined distance from the top surface of the square tube and forms a sliding cavity.

[0011] A first bolt assembly is threadedly connected to the first bolt hole and passes through the sliding cavity;

[0012] The fixing component includes an extended threaded post and a second nut. The extended threaded post is fixedly connected to one end of the square tube and extends out of the waist-shaped hole by a predetermined distance. The second nut is threadedly connected to the extended threaded post and abuts against or separates from the U-shaped block.

[0013] The mounting block is disposed in the U-shaped groove and fixedly connected to the U-shaped block. The mounting block is spaced at a predetermined distance from one end of the U-shaped groove. The mounting block has a plurality of connecting holes. The wire passage cavity and the U-shaped block have a wire-passing channel.

[0014] In one or more embodiments of this application, one end of the square tube with the bow-shaped member extends into the U-shaped groove and abuts against or separates from the U-shaped block, and on a cross section perpendicular to the square tube, the cross-sectional area of ​​the wire passage cavity is greater than the cross-sectional area of ​​the mounting block.

[0015] In one or more embodiments of this application, the top edge of the mounting block near the square tube has a rounded corner.

[0016] In one or more embodiments of this application, the square tube has a solder hole and a screw hole at one end of the bow-shaped member, a screw is screwed into the screw hole, and the top of the screw extends out of the screw hole by a predetermined distance, one end of the bow-shaped member is flush with the end of the square tube, and the inner sidewall of one end of the bow-shaped member abuts against the screw.

[0017] In one or more embodiments of this application, each of the four side walls of the square tube has a pull groove, and the four pull grooves are arranged sequentially at intervals from one end to the other end of the square tube along its length direction, and the four pull grooves are arranged sequentially in a clockwise or counterclockwise direction on the four side walls of the square tube along its circumference.

[0018] In one or more embodiments of this application, the vehicle safety arm assembly further includes four transparent acrylic plates, each of the pull cable grooves is a stepped groove, each of the pull cable grooves is provided with a transparent acrylic plate, and the transparent acrylic plate is located at one end of the larger cavity of the pull cable groove.

[0019] In one or more embodiments of this application, one end of the transparent acrylic sheet is rotatably mounted on one end of the larger cavity of the wire groove. When the transparent acrylic sheet rotates at a predetermined angle, the transparent acrylic sheet closes or opens one end of the smaller cavity of the wire groove.

[0020] In one or more embodiments of this application, a first receiving hole is provided on the bottom wall of one end of the larger cavity of each of the draw grooves, and a first magnet is embedded in the first receiving hole. A second magnet is provided at the other end of each of the transparent acrylic plates. When the transparent acrylic plate closes one end of the smaller cavity of the draw groove, the first magnet and the second magnet attract each other.

[0021] In one or more embodiments of this application, the bottom wall of one end of the larger cavity of each of the draw grooves also has a second receiving hole. The second receiving hole is located outside the first receiving hole in the length direction. The second receiving hole is provided with a hot bimetallic strip. When the hot bimetallic strip is not heated and bent, the hot bimetallic strip is submerged in the second receiving hole. The end of the transparent acrylic plate with the second magnet is spaced at a predetermined distance from the side wall of the draw groove.

[0022] In this embodiment, the vehicle safety arm assembly includes a square tube, a U-shaped block, an arch-shaped member, a first bolt assembly, a fixing assembly, and a mounting block. The square tube has a cable-passing cavity at its center; the U-shaped block has a U-shaped groove, with one end of the square tube extending into the U-shaped groove, and the sidewall of the U-shaped groove has a first bolt hole and a slotted hole; the arch-shaped member is located at the top of one end of the square tube, and one end of the arch-shaped member is fixedly connected to the square tube, with the middle section of the arch-shaped member spaced a predetermined distance from the top surface of the square tube to form a sliding cavity; the first bolt assembly is threadedly connected to the first bolt hole and passes through the sliding cavity; the fixing assembly includes an extended threaded post. The second nut is fixedly connected to one end of the extended threaded post and the extended threaded post extends a predetermined distance out of the waist-shaped hole. The second nut is threadedly connected to the extended threaded post and abuts against or separates from the U-shaped block. The mounting block is located in the U-shaped groove and fixedly connected to the U-shaped block. The mounting block is spaced a predetermined distance from one end of the U-shaped groove. The mounting block has several connecting holes. There is a wire passage between the wire passage cavity and the U-shaped block. The U-shaped block and the square tube can slide relative to each other. The size of the wire passage can be adjusted to facilitate wire threading. The position between the U-shaped block and the square tube is fixed by the fixing component. Attached Figure Description

[0023] These and / or other aspects and advantages of this application will become clearer and more readily understood from the following detailed description of embodiments of this application taken in conjunction with the accompanying drawings, wherein:

[0024] Figure 1 The illustration shows a cross-sectional view of a vehicle safety arm assembly according to this application;

[0025] Figure 2 The figure shows a structural schematic diagram of a vehicle safety arm assembly of this application at a certain angle;

[0026] Figure 3 The diagram shows... Figure 1 A magnified view of a portion at point C;

[0027] Figure 4 The diagram shows... Figure 3 A magnified view of a portion at point D;

[0028] Figure 5 The diagram illustrates the structure of a conventional vehicle safety arm assembly.

[0029] Figure 6 The diagram illustrates the structure of an existing transfer component that works in conjunction with a vehicle safety arm assembly. Detailed Implementation

[0030] The terms and words used in the following specification and claims are not limited to their literal meaning, but are used solely by the inventors to enable a clear and consistent understanding of this application. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of this application is provided for illustrative purposes only and not for the purpose of limiting the application as defined in the appended claims and their equivalents.

[0031] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0032] While ordinal numbers such as "first," "second," etc., will be used to describe various components, there is no limitation on which components are used herein. The term is used only to distinguish one component from another. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component, without departing from the teachings of the utility model concept. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] The terminology used herein is for the purpose of describing various embodiments only and is not intended to be limiting. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It will also be understood that the terms “comprising” and / or “having” as used in this specification specify the presence of the described features, numbers, steps, operations, components, elements or combinations thereof, without excluding the presence or addition of one or more other features, numbers, steps, operations, components, elements or groups thereof.

[0034] Indicative vehicle safety arm assembly, reference Figures 1 to 4 A vehicle safety arm assembly according to a preferred embodiment of the present invention includes a square tube 10, a U-shaped block 20 and a mounting block 30.

[0035] Specifically, the square tube 10 has a wire-passing cavity 101 at its center; the U-shaped block 20 has a U-shaped groove 201, and one end of the square tube 10 extends into the U-shaped groove 201; the mounting block 30 is disposed in the U-shaped groove 201 and fixedly connected to the U-shaped block 20, the mounting block 30 and one end of the U-shaped groove 201 are spaced apart by a predetermined distance, the mounting block 30 has a plurality of connecting holes 301, and a wire-passing channel 1011 is formed between the wire-passing cavity 101 and the U-shaped block 20. More specifically, on a cross section perpendicular to the square tube 10, the cross-sectional area of ​​the wire-passing cavity 101 is larger than the cross-sectional area of ​​the mounting block 30, and the portion of the opening of the wire-passing cavity 101 not blocked by the mounting block 30 forms the wire-passing channel 1011.

[0036] It should be noted that during component formation, the mounting block 30 is first placed in the U-shaped groove 201, and then the mounting block 30 is welded to the U-shaped block 20. Subsequently, one end of the square tube 10 is inserted into the U-shaped groove 201, and the square tube 10 abuts against the mounting block 30. It should be pointed out that in the prior art, after the square tube 10 abuts against the mounting block 30, it is welded to the U-shaped block 20. However, this results in a constant cross-sectional area of ​​the wire passage 1011 between the square tube 10 and the mounting block 30, which is inconvenient when passing the cables of external components through the wire passage cavity 101 and the wire passage 1011.

[0037] Therefore, in this embodiment of the application, the vehicle safety arm assembly further includes an arch-shaped component 40 and a first bolt assembly 50.

[0038] Specifically, the U-shaped groove 201 has a first bolt hole 201 on its side wall, the bow-shaped member 40 is located at the top of one end of the square tube 10, and one end of the bow-shaped member 40 is fixedly connected to the square tube 10. The middle section of the bow-shaped member 40 is spaced at a predetermined distance from the top surface of the square tube 10 and forms a sliding cavity 401. The first bolt assembly 50 is threadedly connected to the first bolt hole 201 and passes through the sliding cavity 401.

[0039] It should be noted that the first bolt assembly 50 can reciprocate along the sliding cavity 401. That is, at this time, one end of the square tube 10 with the bow-shaped member 40 can slide relative to the U-shaped block 20, allowing the end of the square tube 10 with the bow-shaped member 40 to extend into the U-shaped groove 201 and abut against or separate from the U-shaped block 20. It should also be noted that by allowing the U-shaped block 20 and the square tube 10 to slide relative to each other within a certain size range, the size of the wire-passing channel 1011 can be adjusted. Therefore, when passing the cable of an external component through the wire-passing channel 1011, the wire-passing channel 1011 can be enlarged by sliding the U-shaped block 20 or the square tube 10. Clearly, compared to the prior art, this application has the advantage of an adjustable wire-passing channel.

[0040] However, since the first bolt assembly 50 can slide freely within the sliding cavity 401, in order to prevent the square tube 10 or the U-shaped block 20 from moving relative to each other during the movement of the vehicle body, the side wall of the U-shaped groove 201 has a waist-shaped hole 2011; the vehicle safety arm assembly also includes a fixing assembly 60, which includes an extension threaded post 601 and a second nut 602. The extension threaded post 601 is fixedly connected to one end of the square tube 10, and the extension threaded post 601 extends out of the waist-shaped hole 2011 by a predetermined distance. The second nut 602 is threadedly connected to the extension threaded post 601 and abuts against or separates from the U-shaped block 20.

[0041] It should be noted that by loosening the second nut 602 and separating it from the U-shaped block 20, the U-shaped block 20 and the square tube 10 can slide relative to each other. When it is necessary to fix the relative position of the U-shaped block 20 and the square tube 10, the relative position of the U-shaped block 20 and the square tube 10 can be fixed by tightening the second nut 602 and making it abut against the U-shaped block 20.

[0042] Furthermore, to prevent the cables of external components from being scratched by the U-shaped block 20, the top edge of the mounting block 30 near the square tube 10 has a rounded corner.

[0043] Furthermore, since the bow-shaped component 40 and the square tube 10 are welded together, in order to prevent the bow-shaped component 40 from moving along the length of the square tube 10 during the welding process, the square tube 10 has a screw hole at one end of the bow-shaped component 40. A screw 102 is screwed into the screw hole, and the top of the screw 102 extends out of the screw hole by a predetermined distance. One end of the bow-shaped component 40 is flush with the end of the square tube 10, and the inner sidewall of one end of the bow-shaped component 40 abuts against the screw 102.

[0044] Furthermore, if the square tube 10 is arranged vertically, and the second nut 602 is separated from the U-shaped block 20, the U-shaped block 20 will slide downward under the action of gravity, and the first bolt assembly 50 and the arc-shaped member 40 will come into contact and be stressed at the weld joint with the square tube 10. In view of this, in order to improve the welding strength between the arc-shaped member 40 and the square tube 10, the square tube 10 is provided with a solder hole 103 at one end of the arc-shaped member 40, thereby expanding the welding area between the arc-shaped member 40 and the square tube 10.

[0045] Furthermore, since the overall length of the square tube 10 is relatively large, when the cable of an external component extends into the cable passage cavity 101, in order to avoid the cable getting blocked at a certain position in the cable passage cavity 101 and making it difficult to move towards the cable passage 1011, each of the four side walls of the square tube 10 has a cable pull groove 104, and the four cable pull grooves 104 are arranged sequentially from one end of the square tube 10 to the other end along the length direction of the square tube 10, and the four cable pull grooves 104 are arranged in a clockwise or counterclockwise direction on the four side walls of the square tube 10 along the circumference of the square tube 10.

[0046] It should be noted that when the cable is blocked, the external clamps can be passed through the cable pull groove 104 and the cable can be clamped and pushed to move the cable toward the cable threading channel 1011.

[0047] Furthermore, after the cable has successfully passed through the cable passage cavity 101 and the cable channel 1011, to prevent external dust or foreign objects from entering the cable passage cavity 101 from the cable pull groove 104, refer to... Figure 3 The vehicle safety arm assembly also includes four transparent acrylic plates 1041. Each of the cable pull grooves 104 is a stepped groove. Each of the cable pull grooves 104 is provided with a transparent acrylic plate 1041, and the transparent acrylic plate 1041 is located at one end of the larger cavity of the cable pull groove 104.

[0048] It should be noted that by having the light-transmitting acrylic plate seal the cable groove 104, foreign objects are prevented from entering the cable passage cavity 101 and damaging the cable.

[0049] Furthermore, to improve the flexibility of assembly, the transparent acrylic plate 1041 can be installed first, and then the cable can be moved. The assembler can use external clamps to push the cable. One end of the transparent acrylic plate 1041 is rotatably installed at one end of the larger cavity of the cable pull groove. When the transparent acrylic plate 1041 rotates at a predetermined angle, the transparent acrylic plate 1041 closes or opens one end of the smaller cavity of the cable pull groove 104.

[0050] It should be noted that the transparent acrylic plate 1041 normally closes the cable pull groove 104. However, when it is necessary to use external clamps to push the cable, the transparent acrylic plate 1041 can be rotated and one end of the smaller cavity of the cable pull groove 104 can be opened so that the external clamps can be inserted into the cable passage cavity 101.

[0051] Furthermore, to ensure that the transparent acrylic plate 1041 normally closes one end of the smaller cavity of the wire groove 104, refer to Figure 4 Each of the larger chambers of the pull groove 104 has a first receiving hole 1042 on one end of its bottom wall, and a first magnet 1043 is embedded in the first receiving hole 1042. Each of the transparent acrylic plates 1041 has a second magnet at the other end. When the transparent acrylic plate 1041 closes one end of the smaller chamber of the pull groove 104, the first magnet 1043 and the second magnet attract each other.

[0052] In addition, the bottom wall of one end of the larger cavity of each of the pull grooves 104 also has a second receiving hole. The second receiving hole is located outside the first receiving hole 1042 in the length direction. The second receiving hole is provided with a hot bimetallic strip 1044. When the hot bimetallic strip 1044 is not heated and bent, the hot bimetallic strip 1044 is inserted into the second receiving hole. The end of the transparent acrylic plate 1041 with the second magnet is spaced at a predetermined distance from the side wall of the pull groove 104.

[0053] It should be noted that when the cable in the cable passage cavity 101 generates a large amount of heat, the bimetallic strip 1044 bends and deforms after the temperature rises, overcoming the magnetic attraction of the first magnet 1043 and the second magnet, and lifting the transparent acrylic plate 1041 to a predetermined height. At this time, the hot air in the cable passage cavity 101 can exchange heat with the outside air. When the temperature of the cable passage cavity 101 returns to normal and the bimetallic strip 1044 returns to its initial state, if the second magnet on the transparent acrylic plate 1041 is close to the first magnet 1043, the transparent acrylic plate 1041 will close one end of the smaller cavity of the cable pull groove 104 again.

[0054] In summary, the vehicle safety arm assembly described in the embodiments of this application is explained, which provides advantages such as adjustable wiring channels for the vehicle safety arm assembly.

[0055] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The function and structural principle of the present invention have been shown and explained in the embodiments, and any modifications or variations may be made to the implementation of the present invention without departing from these principles.

Claims

1. A vehicle safety arm assembly, characterized by: The vehicle safety arm assembly includes A square tube, wherein the center of the square tube has a wire-passing cavity; The U-shaped block has a U-shaped groove, one end of the square tube extends into the U-shaped groove, and the side wall of the U-shaped groove has a first bolt hole and a waist-shaped hole; An arc-shaped component is located at the top of one end of the square tube, and one end of the arc-shaped component is fixedly connected to the square tube. The middle section of the arc-shaped component is spaced at a predetermined distance from the top surface of the square tube and forms a sliding cavity. A first bolt assembly is threadedly connected to the first bolt hole and passes through the sliding cavity; The fixing component includes an extended threaded post and a second nut. The extended threaded post is fixedly connected to one end of the square tube and extends out of the waist-shaped hole by a predetermined distance. The second nut is threadedly connected to the extended threaded post and abuts against or separates from the U-shaped block. The mounting block is disposed in the U-shaped groove and fixedly connected to the U-shaped block. The mounting block is spaced at a predetermined distance from one end of the U-shaped groove. The mounting block has a plurality of connecting holes. The wire passage cavity and the U-shaped block have a wire-passing channel.

2. The safety arm assembly for vehicles of claim 1, wherein: One end of the square tube with the bow-shaped component extends into the U-shaped groove and abuts against or separates from the U-shaped block. On a cross-section perpendicular to the square tube, the cross-sectional area of ​​the wire passage cavity is larger than the cross-sectional area of ​​the mounting block.

3. The vehicle safety arm assembly according to claim 2, characterized in that: The top edge of the mounting block near the square tube has a rounded corner.

4. The vehicle safety arm assembly according to claim 3, characterized in that: The square tube has a solder hole and a screw hole at one end of the bow-shaped component. A screw is screwed into the screw hole, and the top of the screw extends out of the screw hole by a predetermined distance. One end of the bow-shaped component is flush with the end of the square tube, and the inner sidewall of one end of the bow-shaped component abuts against the screw.

5. The vehicle safety arm assembly according to claim 4, characterized in that: The square tube has a pull groove on each of its four side walls, and the four pull grooves are arranged sequentially at intervals from one end to the other along the length of the square tube, and the four pull grooves are arranged in a clockwise or counterclockwise direction on the four side walls of the square tube along its circumference.

6. The vehicle safety arm assembly according to claim 5, characterized in that: The vehicle safety arm assembly also includes four transparent acrylic plates. Each of the pull cable grooves is a stepped groove, and each pull cable groove is provided with a transparent acrylic plate, with the transparent acrylic plate located at one end of the larger cavity of the pull cable groove.

7. The vehicle safety arm assembly according to claim 6, characterized in that: One end of the transparent acrylic sheet is rotatably mounted on one end of the larger cavity of the wire groove. When the transparent acrylic sheet rotates at a predetermined angle, the transparent acrylic sheet closes or opens one end of the smaller cavity of the wire groove.

8. The vehicle safety arm assembly according to claim 7, characterized in that: Each of the larger chambers of the pull groove has a first receiving hole on one end of its bottom wall, and a first magnet is embedded in the first receiving hole. Each of the transparent acrylic plates has a second magnet at the other end. When the transparent acrylic plate closes one end of the smaller chamber of the pull groove, the first magnet and the second magnet attract each other.

9. The vehicle safety arm assembly according to claim 8, characterized in that: Each of the larger chambers of the pull groove also has a second receiving hole at one end of its bottom wall. The second receiving hole is located outside the first receiving hole in the length direction. The second receiving hole is provided with a hot bimetallic strip. When the hot bimetallic strip is not heated and bent, the hot bimetallic strip is submerged in the second receiving hole. The end of the transparent acrylic plate with the second magnet is spaced at a predetermined distance from the side wall of the pull groove.